[NoOne]

really, we do know.

genetics, diet, muscles etc.. somethings we can control some we cannot.

you cannot willfully improve your talent relative to contexts with no tangible connection. it's just illogical, that's all. it defies logic and well-understood concepts of biology, physics, and probability.. the things we can control are long-term effort, and can't flip a switch at 7pm on october 25th etc. a playoff game context doesn't make you stronger or improve your hand-eye coordination... simply impossible.

it's small sample for any one player, but all players considered since 1871, and thos contexts provide enough data to know it's random and sample size releated, because it's statistically insignfificant relative to average.